Method of producing a specified coefficient of friction on both sides of a substrate
AssigneeSun Chemical Corporation
InventorsAnthony Majszak, Craig Boyd
Life of this patent
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Abstract
The present invention provides a method for printing and coating a flexible substrate web so as to attain a specified coefficient of friction on both sides of the substrate web which employs the use of controlled set-off of coated and/or printed material from the front side to the back side side of the web. Furthermore the method provides a substrate web produced therefrom and the method is useful for packaging substrate webs and, in particular, foil substrate webs.
Claims12
A method of producing a specified coefficient of friction (CoF) on both a first side and an opposite side of a wound flexible substrate web comprising:
- a) unwinding the wound flexible substrate web;
- b) applying at least one layer of varnish to the first side of the unwound flexible substrate web, the varnish comprising at least one wax material that includes polyethylene stearamide wax, and a binder selected from polyamide resin and nitrocellulose resin;
- c) drying the layer of varnish and
- d) rewinding the flexible substrate web such that at least a portion of the varnish on the first side is transferred to the opposite side of the flexible substrate web.
Dependencies are inferred from the claim text.